[toan 11] lượng giác

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pe_lun_hp

1/cosx -(cos^2(4x)/sin2x)=sin2x+sin6x

ĐK :

$\Rightarrow sin2x - cosx.cos^24x = cosx.sin2x.2cos2x.sin4x$

$\Leftrightarrow sin2x - cosx.cos^24x - cosx.sin^24x = 0$

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